EP 0179952 B1 19880914 - METHOD FOR PRODUCING HIGH STRENGTH STEEL WITH GOOD DUCTILITY
Title (en)
METHOD FOR PRODUCING HIGH STRENGTH STEEL WITH GOOD DUCTILITY
Publication
Application
Priority
EP 84201584 A 19841030
Abstract (en)
[origin: EP0179952A1] The present invention provides a method for producing hot rolled steel products having high strength and ductility. The method is particularly suitable for low alloy structural steels, which contain about 0.02 to 0.15 wt % C and 0.100 to about .015 % Nb, the higher Nb percentage being used for steels with the lower C content and vice versa. In the method, the steel is heated to a temperature of about 1150 to about 1250 DEG C. The steel is then rolled during a first sequence of passes so that the average austenite grain size at the end of the first sequence stays below about 50 mu m and so that the last pass in this sequence is conducted within the temperature range of about 950 to 1100 DEG C. In a second rolling sequence directly following the first sequence, the rolling is continued with further reductions that do not exceed about 15% in each pass. Subsequently, the steel may be cooled to ambient temperature in a conventional manner.
IPC 1-7
IPC 8 full level
CPC (source: EP)
C21D 7/13 (2013.01); C21D 8/0226 (2013.01)
Designated contracting state (EPC)
AT BE DE FR GB LU NL
DOCDB simple family (publication)
EP 0179952 A1 19860507; EP 0179952 B1 19880914; AT E37202 T1 19880915; DE 3474042 D1 19881020
DOCDB simple family (application)
EP 84201584 A 19841030; AT 84201584 T 19841030; DE 3474042 T 19841030